80 lines
3.0 KiB
C++
80 lines
3.0 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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namespace gfxstream {
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class ColorBuffer;
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// This class implements async readback of ColorBuffers on both the FrameBuffer
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// posting thread and a separate worker thread.
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class ReadbackWorker {
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public:
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virtual ~ReadbackWorker() = default;
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virtual void init() = 0;
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// Enables readback of the given display.
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virtual void initReadbackForDisplay(uint32_t displayId, uint32_t w, uint32_t h) = 0;
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// Enables readback of the given display.
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virtual void deinitReadbackForDisplay(uint32_t displayId) = 0;
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enum class DoNextReadbackResult {
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OK_NOT_READY_FOR_READ,
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OK_READY_FOR_READ,
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};
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// doNextReadback(): Call this from the emugl FrameBuffer::post thread
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// or similar rendering thread.
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// This will trigger an async glReadPixels of the current framebuffer.
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// The post callback of Framebuffer will also be triggered, but
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// in async mode it should do minimal work that involves |fbImage|.
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// |repaint|: flag to prime async readback with multiple iterations
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// so that the consumer of readback doesn't lag behind.
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// |readbackBgra|: Whether to force the readback format as GL_BGRA_EXT,
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// so that we get (depending on driver quality, heh) a gpu conversion of the
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// readback image that is suitable for webrtc, which expects formats like that.
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virtual DoNextReadbackResult doNextReadback(uint32_t displayId,
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ColorBuffer* cb,
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void* fbImage,
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bool repaint,
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bool readbackBgra) = 0;
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// Retrieves the latest framebuffer that has been posted and read with
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// doNextReadback. This is meant for apps like video encoding to use as
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// input; they will need to do synchronized communication with the thread
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// ReadbackWorker is running on.
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virtual void getPixels(uint32_t displayId, void* out, uint32_t bytes) = 0;
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// Duplicates the last frame and generates a post events if
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// there are no read events active.
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// This is usually called when there was no doNextReadback activity
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// for a few ms, to guarantee that end users see the final frame.
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enum class FlushResult {
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FAIL,
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OK_NOT_READY_FOR_READ,
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OK_READY_FOR_READ,
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};
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virtual FlushResult flushPipeline(uint32_t displayId) = 0;
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};
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} // namespace gfxstream
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